Table 8: Near-infrared photometry of new $\sigma $ Orionis candidates.
Object J z'-J Phot. Prob.a Ref.
S Ori J053724.5-021856 15.36 $\pm$ 0.09 1.22 $\pm$ 0.23 high/high Béjar et al. (2006)
S Ori J053734.5-025559b 15.71 $\pm$ 0.06 2.08 $\pm$ 0.22 high/high 2MASS
S Ori J053855.0-024034c 15.92 $\pm$ 0.07 1.77 $\pm$ 0.22 high/high 2MASS
S Ori J053908.4-023902d 16.46 $\pm$ 0.10 1.57 $\pm$ 0.23 low/high 2MASS
S Ori J053731.9-021634 17.46 $\pm$ 0.08 1.57 $\pm$ 0.23 high/low Béjar et al. (2006)
S Ori J053913.9-021621 17.57 $\pm$ 0.10 2.23 $\pm$ 0.24 high/high Béjar et al. (2006)
S Ori J053813.5-021934 18.56 $\pm$ 0.20 1.57 $\pm$ 0.28 low/low Béjar et al. (2006)
S Ori J053844.5-025514 19.31 $\pm$ 0.08 2.35 $\pm$ 0.28 high/high Caballero (2006)
S Ori J054008.5-024551 19.43 $\pm$ 0.16 2.43 $\pm$ 0.27 low/high Caballero et al. (2006)
S Ori J053932.4-025220 19.54 $\pm$ 0.08 2.37 $\pm$ 0.24 high/high Caballero (2006)
S Ori J053919.2-025910 19.83 $\pm$ 0.09 1.77 $\pm$ 0.29 low/low Caballero et al. (2006)
a Optical / near-infrared photometric cluster membership probability. b 2MASS J05373457-0255589, $H = 14.86 \pm0.0$6, $K_{\rm s} = 14.39 \pm0.08$ mag; c 2MASS J05385492-0240338, $H = 15.17 \pm0.06$, $K_{\rm s} = 14.71 \pm0.11$ mag; d 2MASS J05390846-0239013, $H = 15.72 \pm0.10$, $K_{\rm s} = 15.19 \pm0.13$ mag.

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